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Old 2017-07-25, 16:33   #6
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

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Incidentally, I have just heard from much more knowledgeable people, and I will simply quote:

Quote:
Originally Posted by Robert
Note that the question (u-u) can be answered using the Lambert W function. But, of course, one still must compute the answer numerically via series/Pade approximant, etc.
Note that the W function is not real-analytic.

Bob
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